Micrometer-protractor



K. BERGLOF.

MICROMETER PROTRACTOR.

APPLICATION FILED JUNE'28; I920.

1,382,460. Patented June 21, 1921.

'llll INVEN'IOR W 43% Ms aH'orny UNITED STATES PATENT OFFICE.

KNUT BERG-LOP, OF BUFFALO, NEW YORK.

MICROMETER-IEROTRAGTOR.

Application filed June 28,

To all whom it may concern:

Be it known that I, KNUT BERGLOF, a subj ect of the King of Sweden, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Micrometer-Protractors;

This invention relates to micrometer protractors.

One of the objects of this invention is to provide a protractor having means for quickly setting the straight edges thereof at approximately the desired angle with one another and subsequently adjusting the same by the micrometer attachment to the particular degree and number of minutes or parts thereof, desired.

Another obj ectof this invention is to provide a protractor with micrometer parts, in spring pressed engagemenh, so that these parts can be quickly disengaged in setting the straight edges of the protractor at the approximate angle desired and allowing the spring to reengage the parts in the new approximate angle for subsequent adjustment.

A further object of this invention is to provide a protractor with a micrometer attachment, whereby three straight edges of the said protractor may be so set, that two of them, being fixed relative to one another at right angles, are adjusted as a square to the third straight edge.

With these and other objects my inven-' -tion resides in certain construction, one embodiment of which is illustrated in the drawings, is hereinafter described, its use and operation is explained, and what I claim is set forth.

In the drawings,

Figure 1 is a top plan view of a micrometer protractor embodying my invention.

Fig. 2 is a section taken on the line X-X of Fig. 1'.

Fig. 3 is a perspective view of the sprlngforked worm frame.

In the figures, there is shown fixed upon and spaced from the flat straight bar 1, the

Specification of Letters Patent.

'cut to some desired pitch. The

Patented June 21, 1921.

1920. Serial No. 392,185.

toothed segment 2, having teeth 3, regularly segment 2 is fixed by rivets 1, in spaced relation, upon the bar 1. Fitting in an extension upon the bar 1, is the. pivotal bolt 5, having a tapered head 6 directly engaging a beveled hole in the bar l. J ournaled with the bolt 5, is the Y-frame 7, having extensions 8, which are fixed in spaced relation, by the pieces 9, to the respectivebars 10 and 11, which latter bars are fixed at right angles to one another,

and at an angle of 45 to the axis of the Y- frame 7 The Y-frame 7 is spaced from the bar 1 by the spacing washer 12. The parts engaging the bolt 5 are held together by the nut 13 and the lock nut 14.

V Engaging the outer end of the Y-frame 7, at its parallel edges 15 and 16 is the springforked worm frame 17 having two sets of spring-forks 18 and 19, having the .tines thereof engaging the upper and lower parallel surfaces of the Y-frame 7. There are two tines in each set of forks 18 and 19, having the Y-frame 7 between, and each pair of tines engages a roller 20, journaled with the Y-frame 7 The parallel side portions 21 and 22, of the worm frame 17 are in sliding engagement with the edges 15 and 16 of the Y-frame 7, and are integrally formed with the frame 17. The flat segment 2 is insliding engagement-With the upper surfaces of the side portions 21 and 22 of the frame 17, and fingers 23 integral with the frame 17, are in sliding engagement with the upper surface of the segment 2. The segment 2 is subdivided into degree marks radiating from its inner edge, as shown, and which cover 45 of arc on each side of the center of the segment 2. An index pointer 24 is positioned next to the graduations of the arc. of the segment 2, and is fixed by the screw' 25 to the Y-frame 7 There is jour- 'na1ed upon the tapered ends of screws 26 and 27, a graduated worm 28, graduated around the surface of its ends 29, to give the desired indication correlated with the frame 17, and also with the lock nuts 30, there being provided awasher 31,with each screw, and each washer is provided with a pointer 32, registering with the graduations on the ends 29 of the worm 28; and each reading the same. Or the pointers may be set onehalf a division relative to one another while the graduations of worm ends are correspondingly opposite one another.

In operation, the bars 10 and 11 are positioned in relation to the bar 1, by first pulling outwardly upon the frame 17, causing the tines 18 and 19 to'yield as vagainst the rollers 20 and permit the worm 28 to be disengaged with the teeth 3. During the'tim'e that the worm 28 is so held disengaged, the frame 17, with its engaged Y-frame'Y, and

the bars 10 and 11, is swungv'to the-desired angle, as roughly indicated by the pointer 2d, upon theg-raduated arc'of the segment 2,

after which the operator releases hold upon the frame 17, ipermitting the springtines 18 r to exert themselves to'draw the frame 17 inwardlyv and cause the worm 28fito engage the teeth 3, after which the desired fractional an 1e,=in degreesand minutes or parts of minutes, is fixed by turning the -graduations 'on'the worm ends 29 to register the proper reading against the pointer 32.

The actionof the spring tines 18 and 191s twofold, being each inclined "to theparallel portions 21 and 22 :of'the frame 17-. The

action is to draw these parallel portions closely incontact with the parallelstraight edges 15 and 16,- andalso'to exert a force in the direction of axis of the'Y-frarne 7, to draw the Worm 28 in contact with the teeth-3.

Inasmuch as changes in the spring action I and otherchanges in the 'detailsof' construction, can be madewithout departing from the spirit and scop'e-of my invention, I do not wish to be confined to the zone, embodiment herein illustrated and described, hence I claim, r I

1. A protractor'comprlsmg a bar, a-circular segment fixed to said bar, a frame 'pim otally mounted upon said bar, positioned to turn about an axis common to the center of the said circular segment, means inengagement "with said frame, positioned 'to slide thereon in a direction/radial to the pivotal axis of said frame, :an adjusting element on said means 'engaging said' segment and releasable means for holding said eleme'nt in releasable engagement with said segment.

2. A protractor comprising a bar, a circular segment'fixed to "said bar, a fram'ez pivotally mounted upon said bar and positioned to turn about an axis common to the center of said segment, a member on said frame, said segment havmg'a plurality of teeth positioned concentrically thereon, a worm vplvotally' mounted upon said frame 'to "mounted upon :said' frame to engage said teeth, said worm having a graduated "extBIlSlOIlyHJIl lndicator fixed on said member next the graduatrons 'of SttldBXtBIlSl'OIl, and

'4. In a micrometer :pr'otractor, a straight edged bar,ja frame pivoted to said bar, a circular segment fixed to said bar concent'ric to the pivotal point "of said frame with said bar, a plurality of teeth on one of the circular edges of'said segment, a member-in sliding engagement with said frame to slide radially thereon,said member being also in sliding engagement with said segment, a spring-forked element on said-memberin sliding engagement withs'aid frame, a guide on said :framd-i-n sliding/engagement with "said element, said element extending at an angle 'tothe longitudinzil-axisof said frame and positioned to bear aga-i'nst said guide, a

- worm :pivotally mounted upon said'member and in 'engagement with-said -teeth,:='said worm having a graduated .portion and an indicator fixedto saidmember graduated port on,

=nex-t said 5. Aprotractorcomprisinga bar, a gradw 'ated circular segment fixed to said bar, a frame-rad ally positioned insliding contact -w1th-said1 segment and pivoted to turn about a point-common 'to the center of said segmen't on said bar, a plurality o-f'teethon one edge of 'said segment; a worm fpivotally mounted upon said to engage" said teeth said worm having 'a graduated extension, an indicator fixed on said member next the igraduations "of said extension, and 'two ruling bars fixed to said frame, at ?right angles' vto {one another.

meansfor "releas'ably holding said worm in engagement"with said 'teeth. 

